CN102745735A - Method for recovering rare earth elements from waste red phosphor - Google Patents
Method for recovering rare earth elements from waste red phosphor Download PDFInfo
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Abstract
The invention relates to a method for recovering rare earth elements from waste red phosphor. The method is characterized by: carrying out a calcination pretreatment on collected waste red phosphor in a calcination furnace kiln, and removing organic substances and other elements easily forming volatile gases in the red phosphor; carrying out dissolution decomposition on the calcined red phosphor in an acid (HCl, HNO3)-oxidant (H2O2)-stabilizing additive (acetic acid) composite acid system, and controlling to obtain a low acidity, such that rare earth elements such as Y and Eu or other rare earth in the red phosphor are preferentially dissolved, and completely enter the solution, and the other elements are insoluble substances, and are removed by filtration; after obtaining a rare earth acid solution, adopting an ammonia-free saponified fractionation extraction system to carry out extraction separation to obtain a high purity single rare earth chloride such as YCl3 and EuCl3 or other chlorinated rare earth enriched product solutions; and carrying out processes of precipitation and ignition to obtain a single rare earth oxide such as Y2O3 and Eu2O3 or other rare earth enriched product oxide products.
Description
Technical field
The present invention relates to a kind of method of three wastes comprehensive reutilization, particularly a kind of method that reclaims discarded red fluorescence powder middle-weight rare earths element.
Background technology
China's rare-earth fluorescent powder yield in 2010 reaches 9398 tons in kind according to statistics, increases by 29.9% than the last year.Wherein the phosphor of rare earth 8000 tons of (increasing by 33.3%), 500 tons in colour TV fluorescent material, 450 tons of long persistence luminescent powders, about 448 tons of other fluorescent material than the last year.Expect 2012, China's rare-earth fluorescent powder yield will reach 14000 tons, will consume 6500 tons of all kinds of rare earths.In the production of fluorescent material, the production of three-color fluorescent lamp and using substitute in, the production of colour TV and using all produces the fluorescent material waste material of enormous amount in substituting; Expect fluorescent RE powder waste material in 2012 and will reach 7000 tons; Wherein red fluorescence powder accounts for 30%-40%, and amount of waste material will be 2000 tons-3000 tons.Contain Y at lamp in red fluorescence powder
2O
3Be about 93%, contain Eu
2O
3Be about 7%; And colour TV is Y with red fluorescence powder mostly
2O
2The S:Eu structure wherein contains Y
2O
3Be about 80%, contain Eu
2O
3Be about 5.5%; The YVO that other red fluorescence powders have high voltage mercury lamp to use
4: Eu etc.
Because REE is widely used in new and high technology; Particularly the military technique progress for a country has important effect; China has classified rare earth as the specific mineral of protective mining; Country has carried out strict restriction and management to exploitation rare earth from raw ore, thereby the recovery REE has very important significance and huge economic benefit from the three wastes of rare earth.From the angle of environment protection and renewable resource utilization, also should strengthen the recycling of discarded fluorescent material in addition.
At present, it is considerably less to carry out from the depleted red fluorescence powder technical study work of reclaiming REE both at home and abroad, and the patent of recycling that relates to lamp phosphor is following:
CN101150032 discloses a kind of method that recycles all kinds of discarded fluorescent lamps, and this method comprises gaseous mercury in the recovery; Metal recovery and the recovery of adhering to mercury; The pyrogenic process Separation and Recovery of the recovery of mercury and fluorescent material middle-weight rare earths element and other valuable elements in the fluorescent material.This method is decomposed fluorescent material by the pyrogenic process chlorination, forms chloride, exists problem of environmental pollution and cost high, can not realize industrial, and the rare earth that does not relate in colour TV red fluorescence powder and other red fluorescence powders reclaims.
CN101307391A discloses a kind of method that reclaims discarded fluorescent lamp middle-weight rare earths element; This method adds highly basic (NaOH) in fluorescent material; Be heated to 320 ℃-600 ℃ fusion 2-10 hour; Water logging is filtered the back and is obtained re chloride with the dissolving with hydrochloric acid insolubles, obtains single rare earth oxide through extracting and separating, deposition, calcination again.The rare earth that this method does not relate in colour TV red fluorescence powder and other red fluorescence powders yet reclaims.
Summary of the invention
The purpose of this invention is to provide a kind of low pollution and reclaim the method for discarded red fluorescence powder (comprise lamp with red fluorescence powder, colour TV with red fluorescence powder and other red fluorescence powders) middle-weight rare earths element Y, Eu.
Method of the present invention comprises following step:
1. calcining pretreatment: will discard red fluorescence powder 550 ℃-850 ℃ calcinings 0.5-3 hour, volatilize after making multiple organism and the abundant oxidation of nonmetallic impurity in the fluorescent material, thus the purer MOX of acquisition.
2. acid is dissolved: the red fluorescence powder waste material after will calcining is excellent dissolving in compound acid system, and sour solubility temperature is at 90 ℃-110 ℃, and acidity is at 0.5N-1.0N, and dissolution time was at 3-6 hour, and compound acid consists of: acid (HCl, HNO
3) (89%-92%)-oxygenant (H
2O
2) (3%-5%)-stabilization aid (Glacial acetic acid min. 99.5) (3%-8%), the rare earth metal amount: compound sour volume=1: 3, dissolve through acid the rare earth 98% or more dissolved, 1%-5% is dissolved but impurity such as Fe, Zn, V are only had an appointment.Also can effectively be controlled at this step H simultaneously
2The generation of S waste gas and generation speed are guaranteed the H that produces
2The NaOH solution that S waste gas can be absorbed in the tower absorbs fully.
3. filter: through filtering earth solution is separated with solid impurity, mainly contain REE such as Y, Eu and a spot of Fe, Zn, V impurity element in the earth solution.
4. aphthenic acids extracting rare-earth yttrium (Y): the earth solution concentration after will filtering is adjusted to 0.8-1.0mol/L, pH value is adjusted to 2-3; Getting into organic facies is 22% aphthenic acids+18% mixed alcohol+60% sulfonated kerosene; Use the fractional extraction system of NaOH alkali lye saponification; After 75 grades of extractions and 15 grades of washings; Obtain highly purified yttrium (Y) solution in the water outlet, this solution just obtains the high-purity yttrium oxide finished product through precipitation, calcination; Other rare earths such as Eu then get into organic facies, with acid rare earth back extraction from organic facies are come out to be used for step operation down.
5. zinc reduction extraction Eu: 4. the concentration of the strip liquor in step is adjusted to 0.6-0.8mol/L, pH value is adjusted to 2-3 with the, adds zinc powder and makes Eu
3+Be reduced into Eu
2+, reduction ratio can reach 99%, and the earth solution after the reduction gets into P507-sulfonated kerosene-HCl extraction system under the argon shield condition, after employing three outlet fractionation extn modes are passed through 30 grades of extractions, obtain high-purity Eu at aqueous phase
2+, the Eu of aqueous phase
2+After peroxo-, become Eu
3+, just obtain the high-purity europium oxide finished product through deposition, calcination again.And other a small amount of rare earth RE
3+Then get into organic phase, after back extraction is come out from organic phase with rare earth with acid, just obtain other rareearth enriching material products through deposition, calcination again.
6. reclaim Zn: 4. be provided with the 3rd outlet in the fractionation extn system in step the, the 3rd outlet is enriched with certain flow and the higher zinc chloride (ZnCl of purity
2) solution, this solution can be made into zinc product through sedimentation and filtration washing or direct electrolysis.
Description of drawings
Fig. 1 is a process flow sheet of the present invention
Embodiment
Embodiment 1
Get the 1000g three-color fluorescent lamp with discarded red fluorescence powder, total amount of rare earth (TREO): 81.56%, Eu
2O
3/ TREO:7.25%, Y
2O
3/ TREO:92.73%, other rare earths＜0.02%, 550 ℃ of calcinings 3 hours, acid was dissolved 6 hours in the compound acid system of 2.45L then, and compound acid consists of: hydrochloric acid (HCl) (89%)-oxygenant (H
2O
2) (3%)-Glacial acetic acid min. 99.5 (CH
3COOH) (8%); The rare earth metal amount: compound sour volume=1: 3, acid dissolve condition and are: acidity 0.5N, 90 ℃ of sour solubility temperatures; The molten after-filtration of acid is removed insolubles and is obtained the re chloride that 2.4L concentration is 338.1g/l, and calculating rare earth dissolving yield is 99.5%.Re chloride is diluted to concentration 120 ± 5g/l and transfers PH2.5 ± 0.3; Get in the fractionation extn system that use NaOH saponified organic phase is 22% naphthenic acid+18% alcohol mixture+60% sulfonated kerosene and carry out extracting and separating; After 75 grades of extractions and 15 grades of washings, obtain highly purified Yttrium trichloride (YCl in the water outlet
3) solution, this solution filters with the premium grade oxalic acid precipitation and obtains the solid yttrium oxalate, and the calcination yttrium oxalate just obtains the high-purity yttrium oxide finished product.Eu
3+Then get into organic phase, use high purity hydrochloric acid (HCl) the back extraction organic phase of 4N ± 0.5N concentration, obtain with Europium trichloride (EuCl
3) be the solution of staple, this solution dilution to concentration 120 ± 5g/l and transfer PH2.5 ± 0.3, is added zinc powder in this solution and makes Eu
3+Be reduced to Eu
2+, the Europium trichloride solution after the reduction gets into P507-sulfonated kerosene-HCl extraction system under argon shield, after employing three outlet fractionation extn modes are passed through 30 grades of extractions, obtain high-purity Eu at aqueous phase
2+Solution, the Eu of aqueous phase
2+Behind hydrogen peroxide oxidation, become Eu
3+, just obtain the high-purity europium oxide finished product through oxalic acid precipitation, filtration, calcination oxalic acid europium again.Other a small amount of rare earth then gets into organic phase, uses hydrochloric acid (HCl) the back extraction organic phase of 4N ± 0.5N concentration, obtains rare earth chloride enriched substance solution, just obtains rare earth oxide enriched substance product through oxalic acid precipitation, filtration, calcination again.In the 3rd outlet, obtain liquor zinci chloridi, just obtain the higher zinc oxide product of purity through volatile salt deposition, filtration calcination.
Embodiment 2
Get the 1000g three-color fluorescent lamp with discarded red fluorescence powder, total amount of rare earth (TREO): 81.56%, EU
2O
3/ TREO:7.25%, Y
2O
3/ TREO:92.73%, other rare earths＜0.02%, 850 ℃ of calcinings 0.5 hour, acid was dissolved 3 hours in the compound acid system of 2.45L then, and compound acid consists of: hydrochloric acid (HCl) (92%)-oxygenant (H
2O
2) (5%)-Glacial acetic acid min. 99.5 (CH
3COOH) (3%); The rare earth metal amount: compound sour volume=1: 3, acid dissolve condition and are: acidity 0.5N, 110 ℃ of sour solubility temperatures; The molten after-filtration of acid is removed insolubles and is obtained the re chloride that 2.41L concentration is 337.0g/l, and calculating rare earth dissolving yield is 99.6%.Subsequent process steps is with embodiment 1.
Embodiment 3
Get the 1000g three-color fluorescent lamp with discarded red fluorescence powder, total amount of rare earth (TREO): 81.56%, Eu
2O
3/ TREO:7.25%, Y
2O
3/ TREO:92.73%, other rare earths＜0.02%, 550 ℃ of calcinings 3 hours, acid was dissolved 6 hours in the compound acid system of 2.45L then, and compound acid consists of: nitric acid (HNO
3) (89%)-oxygenant (H
2O
2) (3%)-Glacial acetic acid min. 99.5 (CH
3COOH) (8%); The rare earth metal amount: compound sour volume=1: 3, acid dissolve condition and are: acidity 0.5N, 90 ℃ of sour solubility temperatures; The molten after-filtration of acid is removed insolubles and is obtained the rare earth nitrate solution that 2.41L concentration is 337.0g/l, and calculating rare earth dissolving yield is 99.6%.Rare earth nitrate solution is diluted to concentration 120 ± 5g/l and transfers PH2.5 ± 0.3; Get in the fractionation extn system that use NaOH saponified organic phase is 22% naphthenic acid+18% alcohol mixture+60% sulfonated kerosene and carry out extracting and separating; After 75 grades of extractions and 15 grades of washings, obtain highly purified Yttrium trinitrate (Y (NO in the water outlet
3)
3) solution, this solution filters with the premium grade oxalic acid precipitation and obtains the solid yttrium oxalate, and the calcination yttrium oxalate just obtains the high-purity yttrium oxide finished product.Eu
3+Then get into organic phase, use high purity hydrochloric acid (HCl) the back extraction organic phase of 4N ± 0.5N concentration, obtain with Europium trichloride (EuCl
3) be the solution of staple.Subsequent process steps is with embodiment 1.
Embodiment 4
Get the 1000g three-color fluorescent lamp with discarded red fluorescence powder, total amount of rare earth (TREO): 81.56%, Eu
2O
3/ TREO:7.25%, Y
2O
3/ TREO:92.73%, other rare earths＜0.02%, 850 ℃ of calcinings 0.5 hour, acid was dissolved 3 hours in the compound acid system of 2.45L then, and compound acid consists of: nitric acid (HNO
3) (92%)-oxygenant (H
2O
2) (5%)-Glacial acetic acid min. 99.5 (CH
3COOH) (3%); The rare earth metal amount: compound sour volume=1: 3, acid dissolve condition and are: acidity 0.5N, 110 ℃ of sour solubility temperatures; The molten after-filtration of acid is removed insolubles and is obtained the rare earth nitrate solution that 2.41L concentration is 336.5g/l, and calculating rare earth dissolving yield is 99.4%.Subsequent process steps is with embodiment 3.
Embodiment 5
Get the 1000g colour TV with discarded red fluorescence powder, total amount of rare earth (TREO): 71.74%, Eu
2O
3/ TREO:6.31%, Y
2O
3/ TREO:92.96%, other rare earths: 0.73%, 550 ℃ of calcinings 3 hours, acid was dissolved 6 hours in the compound acid system of 2.2L then, and compound acid consists of: hydrochloric acid (HCl) (89%)-oxygenant (H
2O
2) (3%)-Glacial acetic acid min. 99.5 (CH
3COOH) (8%); The rare earth metal amount: compound sour volume=1: 3, acid dissolve condition and are: acidity 0.5N, 90 ℃ of sour solubility temperatures; The molten after-filtration of acid is removed insolubles and is obtained the re chloride that 2.18L concentration is 326.5g/l, and calculating rare earth dissolving yield is 99.2%.Subsequent process steps is with embodiment 1.
Embodiment 6
Get the 1000g colour TV with discarded red fluorescence powder, total amount of rare earth (TREO): 71.74%, Eu
2O
3/ TREO:6.04%, Y
2O
3/ TREO:92.96%, other rare earths: 0.73%, 850 ℃ of calcinings 0.5 hour, acid was dissolved 3 hours in the compound acid system of 2.2L then, and compound acid consists of: hydrochloric acid (HCl) (92%)-oxygenant (H
2O
2) (5%)-Glacial acetic acid min. 99.5 (CH
3COOH) (3%); The rare earth metal amount: compound sour volume=1: 3, acid dissolve condition and are: acidity 0.5N, 110 ℃ of sour solubility temperatures; The molten after-filtration of acid is removed insolubles and is obtained the re chloride that 2.19L concentration is 326.2g/l, and calculating rare earth dissolving yield is 99.5%.Subsequent process steps is with embodiment 1.
Embodiment 7
Get the 1000g colour TV with discarded red fluorescence powder, total amount of rare earth (TREO): 71.74%, Eu
2O
3/ TREO:6.31%, Y
2O
3/ TREO:92.96%, other rare earths: 0.73%, 550 ℃ of calcinings 3 hours, acid was dissolved 6 hours in the compound acid system of 2.2L then, and compound acid consists of: nitric acid (HNO
3) (89%)-oxygenant (H
2O
2) (3%)-Glacial acetic acid min. 99.5 (CH
3COOH) (8%); The rare earth metal amount: compound sour volume=1: 3, acid dissolve condition and are: acidity 0.5N, 90 ℃ of sour solubility temperatures; The molten after-filtration of acid is removed insolubles and is obtained the rare earth nitrate solution that 2.17L concentration is 326.8g/l, and calculating rare earth dissolving yield is 98.9%.Subsequent process steps is with embodiment 3.
Embodiment 8
Get the 1000g colour TV with discarded red fluorescence powder, total amount of rare earth (TREO): 71.74%, Eu
2O
3/ TREO:6.31%, Y
2O
3/ TREO:92.96%, other rare earths: 0.73%, 850 ℃ of calcinings 0.5 hour, acid was dissolved 3 hours in the compound acid system of 2.2L then, and compound acid consists of: nitric acid (HNO
3) (89%)-oxygenant (H
2O
2) (3%)-Glacial acetic acid min. 99.5 (CH
3COOH) (8%); The rare earth metal amount: compound sour volume=1: 3, acid dissolve condition and are: acidity 0.5N, 110 ℃ of sour solubility temperatures; The molten after-filtration of acid is removed insolubles and is obtained the rare earth nitrate solution that 2.18L concentration is 327.0g/l, and calculating rare earth dissolving yield is 99.4%.Subsequent process steps is with embodiment 3.
Embodiment 9
Get the 2000g high voltage mercury lamp with discarded red fluorescence powder, total amount of rare earth (TREO): 50.10%, Eu
2O
3/ TREO:8.55%, Y
2O
3/ TREO:91.40%, other rare earths＜0.05%, 550 ℃ of calcinings 3 hours, acid was dissolved 6 hours in the compound acid system of 3.1L then, and compound acid consists of: hydrochloric acid (HCl) (89%)-oxygenant (H
2O
2) (3%)-Glacial acetic acid min. 99.5 (CH
3COOH) (8%); The rare earth metal amount: compound sour volume=1: 3, acid dissolve condition and are: acidity 0.5N, 90 ℃ of sour solubility temperatures; The molten after-filtration of acid is removed insolubles and is obtained the re chloride that 2.95L concentration is 335.3g/l, and calculating rare earth dissolving yield is 98.7%.Subsequent process steps is with embodiment 1.
Embodiment 10
Get the 2000g high voltage mercury lamp with discarded red fluorescence powder, total amount of rare earth (TREO): 50.10%, Eu
2O
3/ TREO:8.55%, Y
2O
3/ TREO:91.40%, other rare earths＜0.05%, 850 ℃ of calcinings 0.5 hour, acid was dissolved 3 hours in the compound acid system of 3.1L then, and compound acid consists of: hydrochloric acid (HCl) (92%)-oxygenant (H
2O
2) (5%)-Glacial acetic acid min. 99.5 (CH
3COOH) (3%); The rare earth metal amount: compound sour volume=1: 3, acid dissolve condition and are: acidity 0.5N, 110 ℃ of sour solubility temperatures; The molten after-filtration of acid is removed insolubles and is obtained the re chloride that 2.98L concentration is 335.2g/l, and calculating rare earth dissolving yield is 98.7%.Subsequent process steps is with embodiment 1.
Embodiment 11
Get the 2000g high voltage mercury lamp with discarded red fluorescence powder, total amount of rare earth (TREO): 50.10%, Eu
2O
3/ TREO:8.55%, Y
2O
3/ TREO:91.40%, other rare earths＜0.05%, 550 ℃ of calcinings 3 hours, acid was dissolved 6 hours in the compound acid system of 3.1L then, and compound acid consists of: nitric acid (HNO
3) (89%)-oxygenant (H
2O
2) (3%)-Glacial acetic acid min. 99.5 (CH
3COOH) (8%); The rare earth metal amount: compound sour volume=1: 3, acid dissolve condition and are: acidity 0.5N, 90 ℃ of sour solubility temperatures; The molten after-filtration of acid is removed insolubles and is obtained the rare earth nitrate solution that 2.96L concentration is 332.1g/l, and calculating rare earth dissolving yield is 98.1%.Subsequent process steps is with embodiment 3.
Embodiment 12
Get the 2000g high voltage mercury lamp with discarded red fluorescence powder, total amount of rare earth (TREO): 50.10%, Eu
2O
3/ TREO:8.55%, Y
2O
3/ TREO:91.40%, other rare earths＜0.05%, 850 ℃ of calcinings 0.5 hour, acid was dissolved 3 hours in the compound acid system of 3.1L then, and compound acid consists of: nitric acid (HNO
3) (89%)-oxygenant (H
2O
2) (3%)-Glacial acetic acid min. 99.5 (CH
3COOH) (8%); The rare earth metal amount: compound sour volume=1: 3, acid dissolve condition and are: acidity 0.5N, 110 ℃ of sour solubility temperatures; The molten after-filtration of acid is removed insolubles and is obtained the re chloride that 2.99L concentration is 330.2g/l, and calculating rare earth dissolving yield is 98.5%.Subsequent process steps is with embodiment 3.
Claims (4)
1. one kind is reclaimed the method for discarding red fluorescence powder middle-weight rare earths element, and concrete steps are:
1. depleted red fluorescence powder raw material is calcined;
2. the raw material after the calcining dissolves in composite acid-soluble liquid, makes REE reach optimum solvation;
3. filter earth solution is separated with solid impurity;
4. use naphthenic acid to make extraction agent and adopt the fractionation extn system that yttrium is purified from earth solution, obtain high-purity yttrium solution, obtain the high-purity yttrium oxide product through deposition, calcination again;
5. with hydrochloric acid the rare earth back extraction that 4. go on foot in the organic phase is got off, become the re chloride that mainly contains the europium element, in this solution, add metallic zinc Eu
3+Be reduced into Eu
2+, the re chloride after the reduction with P507-sulfonated kerosene-HCl extraction system, adopts three outlet fractionation extn modes that europium is purified, and obtains high-purity Eu at aqueous phase under argon shield
2+, Eu
2+After peroxo-, become Eu
3+, just obtain the high-purity europium oxide product through deposition, calcination again.And other a small amount of rare earth RE
3+Then get into organic phase, after back extraction is come out from organic phase with rare earth with acid, just obtain other rareearth enriching material products through deposition, calcination again.Zinc chloride then in the 3rd outlet enrichment, obtains the high-purity zinc oxide product through deposition, calcination.
2. the method for claim 1 is characterized in that red fluorescence powder raw material during said step 1. is three-color fluorescent lamp and contains the red fluorescence of REE with cathode-ray picture tubes such as red fluorescence powder, colour TVs with red fluorescence powder, red phosphor powder for high pressure mercury lamp or other; Calcining temperature: 550 ℃-850 ℃, calcination time: 0.5-3 hour.
3. the method for claim 1 is characterized in that the compound acid during said step 2. constitutes: acid (HCl, HNO
3) (89%-92%)-oxygenant (H
2O
2) (3%-5%)-stabilization aid (Glacial acetic acid min. 99.5) is (3%-8%); Condition is dissolved in acid: temperature is at 90 ℃-110 ℃, and acidity is at 0.5N-1.0N, and dissolution time was at 3-6 hour; Consumption is: the rare earth metal amount: compound sour volume=1: 3.
4. the method for claim 1 is characterized in that the organic phase of the fractionation extn system during said step 4. constitutes: 22% naphthenic acid+18% alcohol mixture+60% sulfonated kerosene (using the saponification of NaOH alkali lye).
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103521500A (en) * | 2013-10-22 | 2014-01-22 | 吉林化工学院 | Method for recovering europium hydroxide from discarded displays |
| CN103627906A (en) * | 2013-12-09 | 2014-03-12 | 湖南稀土金属材料研究院 | Comprehensive recycling treatment method of waste rare-earth fluorescent lamp |
| CN105755288A (en) * | 2016-04-01 | 2016-07-13 | 北京工业大学 | Method for recycling zinc in waste cathode-ray tube fluorescent powder and enriching rare earth on basis of self-propagating reaction |
| CN106191446A (en) * | 2016-07-05 | 2016-12-07 | 北京工业大学 | A kind of recovering rare earth Yt method of preparing resin surface composite deposite from waste phosphor powder |
| CN109735719A (en) * | 2019-03-19 | 2019-05-10 | 王柯娜 | A kind of processing method of waste and old television set fluorescent powder |
| CN111392756A (en) * | 2020-05-06 | 2020-07-10 | 龙南县中利再生资源开发有限公司 | Process for extracting high-purity rare earth oxide from fluorescent powder waste |
| CN115072759A (en) * | 2022-05-05 | 2022-09-20 | 龙南京利有色金属有限责任公司 | Method for recovering high-purity europium oxide from rare earth fluorescent powder waste |
| CN115092953A (en) * | 2022-05-05 | 2022-09-23 | 龙南京利有色金属有限责任公司 | Method for extracting rare earth oxide from rare earth fluorescent powder waste |
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| CN102115822A (en) * | 2010-11-18 | 2011-07-06 | 吴泉锦 | Method for recovering rare earth oxide from fluorescent powder and polishing powder waste |
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| CN102115822A (en) * | 2010-11-18 | 2011-07-06 | 吴泉锦 | Method for recovering rare earth oxide from fluorescent powder and polishing powder waste |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103521500A (en) * | 2013-10-22 | 2014-01-22 | 吉林化工学院 | Method for recovering europium hydroxide from discarded displays |
| CN103627906A (en) * | 2013-12-09 | 2014-03-12 | 湖南稀土金属材料研究院 | Comprehensive recycling treatment method of waste rare-earth fluorescent lamp |
| CN103627906B (en) * | 2013-12-09 | 2016-03-23 | 湖南稀土金属材料研究院 | The synthetical recovery treatment process of useless rare-earth fluorescent light |
| CN105755288A (en) * | 2016-04-01 | 2016-07-13 | 北京工业大学 | Method for recycling zinc in waste cathode-ray tube fluorescent powder and enriching rare earth on basis of self-propagating reaction |
| CN105755288B (en) * | 2016-04-01 | 2017-08-25 | 北京工业大学 | A kind of method that zinc in discarded cathodic ray-tube fluorescent powder is reclaimed based on self-propagating reaction and rare earth is enriched with |
| CN106191446A (en) * | 2016-07-05 | 2016-12-07 | 北京工业大学 | A kind of recovering rare earth Yt method of preparing resin surface composite deposite from waste phosphor powder |
| CN106191446B (en) * | 2016-07-05 | 2018-04-17 | 北京工业大学 | A kind of recovering rare earth yttrium from waste phosphor powder and the method for preparing resin surface composite deposite |
| CN109735719A (en) * | 2019-03-19 | 2019-05-10 | 王柯娜 | A kind of processing method of waste and old television set fluorescent powder |
| CN111392756A (en) * | 2020-05-06 | 2020-07-10 | 龙南县中利再生资源开发有限公司 | Process for extracting high-purity rare earth oxide from fluorescent powder waste |
| CN115072759A (en) * | 2022-05-05 | 2022-09-20 | 龙南京利有色金属有限责任公司 | Method for recovering high-purity europium oxide from rare earth fluorescent powder waste |
| CN115092953A (en) * | 2022-05-05 | 2022-09-23 | 龙南京利有色金属有限责任公司 | Method for extracting rare earth oxide from rare earth fluorescent powder waste |
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